/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.pinot.segment.local.segment.index.loader.defaultcolumn;

public interface DefaultColumnHandler {

  /**
   * Update the auto-generated default columns.
   * <p>Supported default column actions include: <code>ADD/UPDATE/REMOVE DIMENSION/METRIC</code>
   *
   * @throws Exception
   */
  void updateDefaultColumns()
      throws Exception;

  /**
   * Check if there is a need to add/remove/update the auto-generated default columns
   * for the segment, according to the current table schema.
   * @return true if there is a need to update.
   */
  boolean needUpdateDefaultColumns();
}
